Cowl lamp



Now 9,1926. L606J52 H. A. DOUGLAS COWL LAMP Filed June 5, 192 5 Patented Nov. 9, 1926.

1 warns stares imam; rarest orsics.

' HARRY A., ;oouGLns, or anon-son, MICHIGAN.

CQWL LAMP.

Application filed June 3, 1925. Serial No. 34,590.

mitting openingformed in a side of the cowl.

In accordance with one of the features of the invention the diameter of the cowl is reduced at its ends to thereby form internal annular shoulders which are engaged by the shutter that is disposed within the cowl and between said shoulders. The shutter is made of resilient metal and of a size before its assembly within the cowl requiring it to be contracted for insertion within the cowl and distending, when located, to engage the wall portion of the cowl that is in the same Zone with the shutter, whereby no inner annular walls surrounded by the shutter and located at the shoulders need be employed for holding the shutter in place. The distending action of the shutter, due to its resilience, also occasions tight frictional engagement between the shutter and the surrounding portion of the cowl, so that the shutter will be held in any adjustment whether, it is fully opened, partially opened, or fully closed.

The invention will be more fully ex-v plained in connection with the accompanying drawing in which Fig. 1 is a side view showing a cowl of my invention applied to an incandescent electric lamp; Fig. 2 is a sectional view on line 2-2 of Fig. 1; Fig. 3 is a sectional view on line 33 of Fig. 1; Fig. 4 is a side view of the cowl taken in a clifferent direction from that in which Fig. 1 is taken and showing the shutter in another adjustment; and Fig. 5 is a perspective view of the shutter. p

The lamp structures to which the cowls of my invention are applicable may be of a variety of forms, the lamp structure illustrated being shown merely as an example.

The tubular shell 1 has a plug'2 secured to one end thereof, this plug carrying contacts 3, 4 working within spring barrels 5, 6, the rear ends of the contacts having enlargements which engage the in turned front ends of the spring barrels so that the contacts are prevented from leaving engagemobile, for example.

ment with the barrels. These spring barrels 1;

are connected with circuit terminals as usual. n H

Coiled springs T and 8 are disposed in the spring barrels 5, 6 for the purpose of thrusting the contacts 3 and l outwardly. The shell 1 has bayonetrecess formations 9, 10 by means of which a lamp bulb may be held within the socket, the base of the lamp bulb carrying bayonet pins 11 for reception within the bayonet recesses and when the lamp bulb is thus engaged with the shell 1 the contacts 3 and t are thrust, by the springs 7 and 8, into engagement with the contacts 12 and 13 carried by the base of the lamp bulb and constituting terminals of the lamp filament 14-. The bayonet recesses '9 are formed by'outward depressions in the forward end of the shell.

The lamp bulb receiving end of the shell is spread outwardly to form a flange 15 that i i;

constitutes an abutmentto define the position of the shell with respect to the mounting 16 whichmay be a dashboard in an auto- The annular flange 15 is extended to form a mounting lug or lugs '71 17 extending laterally of the shell and which may be provided with screw holes for the reception of screws 18 employed to fasten the fastening lugs upon the dashboard or upon the short tube 19, the light from the lamp bulb passing through the opening or passage 21'in the cowl or hood to shine directly upon the object to be illuminated.

The cowl is preferably formed of sheet material, preferably metal, and is of cylindrical shape. The diameter of the cowl is reduced at its ends to form annulan shoulders 22, 23, which are spaced apart from the light transmitting opening 21 in the cowl that is disposed between the shoulders. The outer end 24 of the cowl continues from the shoulder 22 and is preferably dome shaped. The shutter 25 is also cylindrical,

other support. The flange alsohas a short this shutter being made of resilient ma terial, the shutter being of larger diameter than the cowl before the shutter is in place so as to require compression. or contraction in order that it may be entered into the cowl. This shutter is of a width, measured along the axis of the cowl, which will permit it to be snugly received between the shoulders 22 and 23, the shutter dist-ending into engagement with the portion of the cowl that is between said shoulders, whereby the shutter will remain in any position to which it is adjusted by its rotary movement owing to the tight frictional engagement occurring between the shutter and cowl, the shutter also thereby being confined between the shoulders 22 and 23 without the necessity of employing any holding formations to be surrounded bythe shutter. The shutter is formed with a light. transmitting opening 26 of substantially the size and shape of the light transmitting opening 21 in the cowl and in the same zone therewith so that the shutter may be adjusted to various positions in which the opening 21 is entirely uncovered by the shutter, a condition which exists when the shutter opening 26 is in register with the cowl opening 21., or in which the shutter partially or completely closes the cowl opening 21. The shutter is provided with a handle 27 mid way between the arcuate sides of the shutter opening 26 and adjacentone end of this opening. The cowl opening 21 is laterally extended as indicated at 28'and 29 to receive the inner end of the handle 27 when the shutter is adjusted to completely close or completely open the cowl opening 21. The openings 21 and 26 in the cowl and shutter are preferably less than 180 in arcuate length, but the shutter itself extends more than 180 in order that it may, due to its distending action, have frictional engagement with the surrounding cowl.

In the preferred embodiment of the invention the ends of the shutter very nearly meet, particularly where the arcuate length of the light transmitting openings 21 and 26 is nearly 180. v

I do not wish to limit myself to the bulging of the cowl as indicated at 24. although this bulging is preferred because of appearance and to furnish ample clearance between the imperforate end of the cowl and the outer-end of the lamp bulb.

Having thus described my. invention I claim:

1. A cowl for incandescent electric lamps comprising a cylindrical body of sheet ma terial having a lateral opening and a shutter for controlling said opening, said shutter comprising a resilient ring split throughout its length and sprung into rotative association with the body, and means for holding said ring against movement relative to the body in the direction of the axis of rotation of said ring.

2. A cowl for incandescent electric lamps comprising a cylindrical body of sheet material having an annular groove and provided with a lateral opening within the side limits of the groove, and a shutter for con trolling said opening, said shutter comprising a resilient split ring sprung into said groove whereby pressure of the shutter against the base of said groove provides a predetermined frictional resistance to movement of the shutter relative to the body.

In witness whereof, I hereunto subscribe my name.

HARRY A. DOUGLAS. 

